ASoC: SOF: Intel: clarify initialization when HDA_AUDIO_CODEC is not used

ASoC: SOF: Intel: clarify initialization when HDA_AUDIO_CODEC is not used

For LunarLake support, we need to enable HDA_LINK but we also want the
ability to remove HDaudio codec support, e.g. for 'nocodec'
tests. This requires a small change in the bus initialization without
any codec-specific callbacks provided.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com
Reviewed-by: Rander Wang <rander.wang@intel.com
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com
Link: https://lore.kernel.org/r/20230512181702.117483-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org